Archive for the 'Engine Topics' Category

New Youtube Videos, AE 0.1cc Diesel Engine

Monday, November 13th, 2017

The AE0.1 video continues to be popular. I made a couple new videos about this engine. First a look inside the engines to see just how small the parts are. I also made a Solidworks model where it’s easier to see some of the design features.

Chicago Model Engineers Association 2015 Show

Sunday, October 4th, 2015

I had a chance to visit the Chicago Model Engineers Association show this year. These are photos of the models that were displayed.

OS FS-120SII Gas Glow Conversion

Tuesday, August 11th, 2015

I had an OS FS-120SII I was going to run with ignition and gasoline. I found a suitable Walbro carb, but it needed a few parts to mount to the engine. Details can be found here OS FS-120SII Gas Glow Conversion. There is also a video of machining one of the parts required on a […]

Enya 41-4C Teardown video posted.

Wednesday, March 26th, 2014

I posted this video to my youtube account the other day. Cleanup and inspection and reassembly videos to follow.

Timing the OS Four stroke Camshaft

Wednesday, May 15th, 2013

This comes up quite often. I made a quick video using a CAD model of the FS-30.

YS-91AC Supercharged Four Stroke Glow to Gas Conversion

Friday, April 19th, 2013

I’ve been thinking about this project for a few years. Recently, I spoke with a friend who had the same idea and it renewed my interest. The original concept was to somehow modify the existing fuel regulator to be compatible with gasoline. The YS system contains a fuel inlet “needle” which is made of silicone. […]

Updated FS-48 setup.

Tuesday, September 20th, 2011

Last year I posted a video of the FS-48 at the flying field. I have installed a Robart fueling valve and Cline fuel regulator. The fuel regulator improves consistency of mixture setting for the large 13 oz on-board tank. The valve allows starting and warm up with an auxiliary fuel tank containing standard model diesel […]

Books for Engine Fanatics

Monday, December 6th, 2010

I didn’t read many books in the past. I gathered most of my information about engines from magazines and internet sources. This was OK until I ran out of depth in the material. There is plenty to read, but pretty soon it’s all the same. Books go much deeper and I found that I enjoy […]

IHobbyExpo 2010

Thursday, October 21st, 2010

The IHobbyExpo show has certainly changed since I first attended 15 years ago.  The economy and the internet have reduced the number of exhibitors and visitors. New products are often found on the internet before the show. Still, some manufacturers manage to keep a few things quiet. On to the good stuff. OS Engines will […]

Some Updates

Wednesday, November 11th, 2009

I’ve been adding some videos to the How To page. I hope to add more as time is available. A Saito rebuild is next on the list. A few new engine manuals have been uploaded to the Download page. I have more to scan and upload in the near future. I am considering offer several […]

NAMES Expo and Other News

Monday, April 20th, 2009

I visited the NAMES Expo this weekend. I managed only a few photos. I was preoccupied with observing the various engine designs.         In other news, I’ve had a few inquiries about the bearing puller. I’ve been busy with work recently but will make up several for sale. Please contact me for […]

Camshaft Bearing Puller

Friday, January 30th, 2009

I finally decided to make a bearing puller to remove camshaft bearings from OS four strokes. These can be, at times, very hard to get out by heating the crankcase. This tool lets me pull them without any issues. Slip the tool in and crank it out with a wrench.

FS-52 Spark Runs Great!

Wednesday, October 15th, 2008

I’ve flown the FS-52 with spark ignition with methanol fuel. The fuel was 8% Klotz Original Techniplate and balance methanol. After test running the engine with this fuel at home, I checked for oil under the rocker cover. There was plenty. I’m convinced the crankcase ventilation system works as it should and draws oil through […]

FS-52 Spark Ignition Photos

Saturday, October 4th, 2008

I’ve added photos of the FS-52 spark conversion. I haven’t flown it yet, but expect to run and fly the engine in a few days. I expect it to run well. I have learned that the RCEXL ignition will operate well past 8,000 RPM and the 10,000-11,000 RPM I expect to run at will be […]


Tuesday, September 2nd, 2008

I’ve been able to get some flying time in this summer. I put a few hours on an Enya 46-4C II with spark ignition. It has a CH Ignitions system installed. I bought it online at auction. It’s old, there was a note written in the box, “Run 6-28-88.” It uses the mechanical timing advance […]

Machines and Ideas

Thursday, May 1st, 2008

I’m short on time right now, but am in the process of replacing my lathe with something a little more stout. I’m also searching for some tooling. In the mean time I’ve decided to do some testing with E85 fuels and glow ignition. It seems some have had good luck running E85. Running E85 with […]

More FS-91 Surpass Diesel Conversion

Wednesday, October 3rd, 2007

I continue to work on the FS-91 conversion. I think that the carb for this size engine is becoming the sticking point. The acceptable air/fuel mixture range is rather narrow and the model carbs lack the proper tuning. Since model diesel fuel, especially without ether, approaches air/fuel ratios of gasoline I decided to try a […]

FS-91 Update

Monday, September 17th, 2007

After making a new “lanova” cell I attempted to run the engine. It started and ran but was not happy. I sleeved the throat of the carb, but this did not improve things significantly I was able to get about 6500RPM out of it. The carb needles were very hard to adjust and it wouldn’t […]

O.S. FS-91 Surpass II runs!

Monday, August 13th, 2007

I got it on the bench today and ran the FS-91 today. I ran into a minor problem with my adjustable compression device and will have to make another. I made a mistake during machining and it failed shortly after the engine warmed up. Everything looks good. A little shop time I’ll give it another […]

Norvel .074 Diesel Conversion Runs

Wednesday, August 1st, 2007

I ran the Norvel .074 Diesel Conversion today. Running the previously mentioned fuel which is 28% castor oil, 35% ether, 35% kerosene, and 2% amyl nitrate, it turned a Graupner 8×4 Super Nylon at approximately 11,000 RPM. Idle was roughly 4500. The engine is getting better with runtime. It has only about one hours total […]